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Thread: Nehalem Overclocking @ XS

  1. #1
    Xtreme Owner Charles Wirth's Avatar
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    Nehalem Overclocking @ XS

    Intel I7 965 @ 5.247Ghz
    Gigabyte X58 UD5
    3 Stage cascade -100c
    Corsair 2133 Dominator DDR3

    Voltages

    vcore ~1.5v, this is a "leaky" high IDV chip, scaling up with higher voltage is possible at a cost of runaway amp phenomena.
    vmem ~2.2v for benching 2v on Vapo, compensate voltage with cooling to be safe.
    vqpi ~1.35v depending on the board/bclock, upwards of 1.55v if I am pushing bclock, I run a low bclock so I usually leave it on stock.
    vmem is the secret to uclk, 2.2v gets you 4.7Ghz ulck. uclk is also known as uncore.

    general ratios

    Stock QPI on i7 965 is x48 @ 133 bclock, if you raise the bclock to 160ish you would need to drop qpi ratio to X44 to continue raising the bclock to 180ish, drop qpi again to X36 again and that will get you out the theoretic max bclock of 220. That is not set in stone, some chips/board combos have exceeded these numbers but this rule is pretty close to what you will see on C stepping.

    The uclk ratio I prefer to use is (the lowest possible) 1:2 of my ram speed (uclk runs at twice the speed of memory) and at lower speeds there are plenty more ratios to scale higher without running the sick memory speeds that I do, this is a huge gain in performance but for me it requires a lot of vmem and high end memory to run upwards of 2300Mhz (4700Mhz uclk) the memory controller has exceptional is its stability at this speed, I have not reached top speed and it will take even faster ram and more vmem to achieve that.



    Runaway amp phenomena, I hook an amp meter to the four yellow wires on eight pin power cable that connects near the CPU. Watching this you will see that yes you can keep scaling up with more voltage but your chip has a limit with all cores loaded that it will runaway on amps till it crashes. I know exactly what range to stay in with cores loaded to know not to hit this runaway threshold. Keeping vcore down and disabling HT lets me run at the chips max speed, HT has an added power load on the CPU, disabling it helps gain critical Mhz.




    Max Uncore and QPI, memory speed is correct, SPD 9-9-9-24










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    Damn. you dont waste any time do you.
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    all i can say is: Wooooo!!!

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    No signs of a coldbug i guess.?
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    Quote Originally Posted by Vapor View Post
    There's a lot less voodoo in watercooling than is assumed
    The only thing future proof in electronics, is the electricity itself.

    Any one who relies on only one source of information is a fool.

  5. #5
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    Thanks for sharing!
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    great job Fugger isnt that ram voltage high for a Nehalem based board? Good to see some results I do hope it can be pushed a little futher but maybe with a release of a newer stepping will show more potential That CPU voltage is really good for that clock wow this is a great job indeed, now lets hit 6ghz like the Qx9650
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  7. #7
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    nice clock


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  8. #8
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    nice man

    noticed you werent using too high of a bus freq, how far up were you able to get it before raising multi?
    E8400 @ 4.8Ghz on Vapochill LS | NVIDIA 790i Ultra SLI | BFG GTX 280 SLI | PC Power & Cooling 1200W | Bench Sled

  9. #9
    Xtreme Owner Charles Wirth's Avatar
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    My ram voltage is fine for the temps, I can go up to 2.3v but not needed on the Samsung Rev E

    Bus frequency (bclock) is maxed for top qpi speed, 162 I need to ratio down the qpi speed.
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    36 multi

    this is looken good
    kill it FUGGER
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  11. #11
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    Nice stuff (FINALLY some numbers. thanks!), but do these CPUs hate voltage? I'm used to see 2v++ from the Intel benchers around

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    Nice stuff Fugger!

    Are the latencys right at the cpu-z validation?

    Do you have a 32M-Run with 5Ghz or more?

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    Boohaaa and we enter a new area of overclocking... jeez those bandwith numbers make me drool , would triple channel even be faster ?
    Question : Why do some overclockers switch into d*ckmode when money is involved

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  14. #14
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    Way over 5Ghz and such a low Vcore.. damn nice. Makes me think around 4,8Ghz should be attainable 24/7 stable on phase. *goes away to check his credit cards*
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    Nice!

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    WooooooT amazing clock Fugger

    love max Uncore clk 4.45GHz
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    Damn this crappy runs like hell!!!!!
    How about more FSB for the lower ones, like i940?
    Haven't u been able to get a higher one?


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    Nice stuff, short and to the point with pure big numbers, the way it's meant to be done.

    You've been a busy guy Charles.

  19. #19
    Xtreme Owner Charles Wirth's Avatar
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    Ive had time on the cascade to dial in and rerun stuff, anxiously waiting for others to post tonight and tomorrow with killer results.

    Taking pics off the camera and Ill show insulation on three boards.
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  20. #20
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    Quote Originally Posted by FUGGER View Post
    and tomorrow with killer results.


    I'll be waiting!

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    sweet

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    Omg and everyone was saying they would not oc close to 6ghz.. I'm pretty sure they will when you guys get the hang of it completetly

    Why did you run 4 cores for sp1m? Wouldn't it go higher with fewer cores enabeld?

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    EVIL CPU !

    Thats just SOOOOO FAST
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    Quote Originally Posted by FUGGER View Post
    Ive had time on the cascade to dial in and rerun stuff, anxiously waiting for others to post tonight and tomorrow with killer results.

    Taking pics off the camera and Ill show insulation on three boards.
    I hope you've got some serious stuff coming :P
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  25. #25
    Xtreme Owner Charles Wirth's Avatar
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    More images added.
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